| Sequencing the genome of the novel coronavirus reveals tiny variations that allow experts to track its movements and detect mutations that could pose new threats. But the United States has sequenced less than one-half of 1 percent of the cases in its massive outbreak, far behind countries such as Australia and Britain. Many states have produced only a handful of sequences in total. Scientists say the country's disorganized effort represents yet another failure to fight the virus with the most advanced tools available. | 
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